While I love adding and flying to new airports, I have more of an aircraft goal. For example, I would like to add the MD-82 (before AA retires all of them) and the 747 (any variant) to my list. So far with the 737 series I have flown on the -200/-300/-400/-500/-700/-800. I can't get the rare -100 anymore but I would love to add the -600 (WestJet) and the -900 (not hard to find at all) at some point.